Apart from the modifications to the CPU pins, everything else is original Atari or even C-Lab. The modifications correspond to the latest version of the schematics diagram or Service Manual.

I would replace the CPU completely if the pads on the board are still OK and solder a new NVRAM Modul in ...

MacTech05 wrote: ↑Fri Sep 08, 2023 3:35 pm I measured the voltage of the orange wire at J100 at startup, would not boot. Initially the voltage was 5 VDC, then drops and settles steady at 4.97 VDC (orange wire at J100).

So PowerGood is fine.

When the Computer do not boot up check if I'm not sure but the first cable should be orange must has high level (+5V) ...

The original 10uF values work perfectly in thousands mainboards, so there is no reason to install larger ones. The fault must be have other reasons. The Powergood line from the powersupply is important for example...

Try it ...

... both are the same except for the reset connection.


https://forum.atari-home.de/index.php/t ... l#msg91556

...

... what is a Molex PSU? You mean a pico psu with an external 12V power supply? 80 watts is the smallest and there are ATX adapter cables to build a connection cable to the Atari mainboard.

BEST has new ones to sell ...

The inductance and the 470uF capacitor feed the 5V voltage for the dram banks from the mainboard. So the memory only draws too many amps.

See the 1040ST Schematics ...

Yes.

He should build a ATI MACH32 Emulator or a ET4000W32i ...?